Protecting The Builders: The Hidden IAQ Risks in Construction
The conversation around indoor air quality (IAQ) and the built environment typically centres on the operational phase of a building, and how finished spaces impact the occupants who live and work in them. But what about the environment before the keys are handed over?
In our latest Air Quality Matters episode, we shift our focus to construction and demolition. We sat down with Angie Brooker , Occupational Health Manager at Multiplex , to peel back the layers of how we protect the tip of the spear: the workers building our environment.
This episode reveals just how layered, dynamic, and complex managing respiratory risks in a construction setting truly is.
The Dynamic Hazard of Construction Dust
Unlike a finished, ventilated office, a construction site is a constantly evolving environment. The risks morph daily and even hourly.
Angie highlights that operatives aren't just dealing with general nuisance dust. They are exposed to wood dust and highly hazardous silica dust. Furthermore, the risk isn't isolated to the person holding the tool; ambient background pollution lingers long after a specific task is finished, creating compounding risks for everyone navigating the site.
Redefining the Hierarchy of Controls
One of the most interesting parts of the conversation is Multiplex's proactive approach to occupational health, starting at the very top of the risk-management pyramid: substitution.
We explore Multiplex's "Silica 25" initiative and their decisive move to ban engineered artificial stone on upcoming projects. This product, often used for aesthetic kitchen worktops, can contain up to 90% silica and has been linked globally to severe, rapid-onset silicosis.
The conversation also dives into the practicalities of engineering controls on site. Angela explains the push to replace the trusty, but highly inefficient, site broom with M and H-class vacuums to stop dust from becoming resuspended in the breathing zone.
The Cultural Battle for Long-Term Health
The construction industry has an incredible track record of adopting strict protocols to address immediate safety risks, such as falls, heavy machinery accidents, and electrocution. However, advocating for long-term occupational health is a much harder sell.
Angela shares the everyday reality of trying to communicate a 10-to-30-year latent risk to operatives who feel invincible and are solely focused on finishing their immediate daily tasks. Through regular "Health Intervention Tours" (HITs), her team is working to shift the culture so that health is shouted about just as loudly as safety.
Intriguing Highlights from the Episode
The "Christmas Decoration" Phenomenon: A particularly compelling moment is Angela’s description of FFP3 masks being treated as decorations—left hanging from hard hats or scaffolding once a task is done. This entirely defeats their purpose, as ambient dust settles inside them before they are worn again.
The Facial Hair Challenge: We discuss the severe limitations of standard paper PPE, the ongoing challenges of facial hair preventing proper mask seals, and the growing need for powered air-purifying respirators (PAPRs).
A Call for Innovation: The episode sparks a conversation about the future of site safety: the need for a low-cost, visual "traffic light" dust monitor that can be moved from room to room, giving workers immediate, intuitive control over the air they breathe.
Hearing Angie detail the on-the-ground reality of these health interventions is a facinating window into how we should and can manage risk in the construction phase of a building and a lesson in there for all of us who step on site.
It's a bit of a looking glass episode this, you won't see sites the same way again! Plus we had a right old go at poor Henry!
One Take: The Psychology of IAQ Behaviour Change
In this week’s brief One Take episode, we move from the construction site to the home, diving into a brand-new 2026 paper from Building and Environment. The study explores the psychological and contextual drivers of indoor air quality behaviors in a deprived urban community.
Based on the longitudinal "Well Home" project, this participatory research tracked 110 households over an 18-month period. Using an adapted framework, the findings challenge some of our most basic assumptions about how to drive public health interventions.
Key insights discussed in the episode:
Scare Tactics Don't Work: Echoing previous European studies, making people feel personally vulnerable to air pollution did not drive behavior change. Instead, residents took action when they understood the severity of the issue and possessed self-efficacy—the confidence that their actions could actually fix the problem.
The Mold Effect: The strongest visual cue to action across the entire study was visible damp and mold. However, as we discuss, mold is a late-stage indicator; relying on it means we are reacting months too late.
Time Builds Confidence: The study proves that engagement is a marathon, not a sprint. The longer residents participated in the project, the more their confidence grew, leading to significant changes in complex behaviors like cooking and heating ventilation.
This 10-minute breakdown is a must-listen for anyone interested in why sustained engagement outshines one-off flyers, and how empowering communities is our best tool for improving indoor health.
The Air Quality Matters Podcast in Partnership with
Particles Plus - Eurovent- Aico - Farmwood
The One Take Podcast in Partnership with
SafeTraces and Inbiot
Do check them out in the links and on the Air Quality Matters Website.
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